On the 4.0 you NEED the double plats - or half of the plugs go south
while the other half is still good. If you are too CHEAP to use the
specified plug, change them every year.
On my 3.0 I used standard non-plats and changed them every 50,000km. I
figured it was better that way than letting the plats sieze in, then
pull the motor to replace the plugs.
Thanks for your input you two. I've always been of this mind but was scared
that the engine would do the exact same thing to the much higher priced
double platinums. You can understand a concern like that, I'm sure.
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